Fix lint errors

.github/workflows/golangci-lint.yml

@@ -16,23 +16,5 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
-          # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
           version: latest
-
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-
-          # Optional: golangci-lint command line arguments.
           args: -E bodyclose,misspell,gosec,goconst,gci,errorlint
-
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true
-
-          # Optional: if set to true then the action will use pre-installed Go.
-          # skip-go-installation: true
-
-          # Optional: if set to true then the action don't cache or restore ~/go/pkg.
-          skip-pkg-cache: true
-
-          # Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
-          skip-build-cache: true

extract.go

@@ -4,7 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -33,18 +33,19 @@ func ExtractPostmortems(loc string, dir string) error {
 
 	var data []byte
 	if isURL(loc) {
+		// #nosec
 		resp, err := http.Get(loc)
 		if err != nil {
 			return fmt.Errorf("could not get %q: %w", loc, err)
 		}
 		defer resp.Body.Close()
 
-		data, err = ioutil.ReadAll(resp.Body)
+		data, err = io.ReadAll(resp.Body)
 		if err != nil {
 			return fmt.Errorf("could not read response body: %w", err)
 		}
 	} else if isFile(loc) {
-		data, err = ioutil.ReadFile(loc)
+		data, err = os.ReadFile(loc)
 		if err != nil {
 			return fmt.Errorf("error opening file %q: %w", loc, err)
 		}

postmortem.go

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"text/template"
@@ -118,7 +117,7 @@ func GenerateJSON(d string) error {
 		return err
 	}
 
-	err = ioutil.WriteFile(fp, j, 0644)
+	err = os.WriteFile(fp, j, 0600)
 	if err != nil {
 		return err
 	}
@@ -149,7 +148,7 @@ func GenerateJSON(d string) error {
 			if err != nil {
 				return err
 			}
-			err = ioutil.WriteFile(fp, j, 0644)
+			err = os.WriteFile(fp, j, 0600)
 			if err != nil {
 				return err
 			}
@@ -189,7 +188,7 @@ func (pm *Postmortem) Save(dir string) error {
 	}
 
 	// Write postmortem data from memory to file.
-	if err := ioutil.WriteFile(filepath.Join(dir, pm.UUID+".md"), data.Bytes(), 0644); err != nil {
+	if err := os.WriteFile(filepath.Join(dir, pm.UUID+".md"), data.Bytes(), 0600); err != nil {
 		return fmt.Errorf("error writing file: %w", err)
 	}
 

server/handlers.go

@@ -3,10 +3,10 @@ package server
 import (
 	"compress/flate"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
+	"strings"
 	"text/template"
 
 	"github.com/go-chi/chi/v5"
@@ -76,7 +76,7 @@ func LoadPostmortem(dir, filename string) (*postmortems.Postmortem, error) {
 // LoadPostmortems parses the postmortem files
 // and returns a slice with their content.
 func LoadPostmortems(dir string) ([]*postmortems.Postmortem, error) {
-	files, err := ioutil.ReadDir(dir)
+	files, err := os.ReadDir(dir)
 	if err != nil {
 		return nil, fmt.Errorf("error opening data folder: %w", err)
 	}
@@ -203,9 +203,15 @@ func postmortemPageHandler(w http.ResponseWriter, r *http.Request) {
 func postmortemJSONPageHandler(w http.ResponseWriter, r *http.Request) {
 	pmID := chi.URLParam(r, "id")
 
+	// Validate pmID to ensure it does not contain path separators or parent directory references
+	if strings.Contains(pmID, "/") || strings.Contains(pmID, "\\") || strings.Contains(pmID, "..") {
+		http.Error(w, "Invalid postmortem ID", http.StatusBadRequest)
+		return
+	}
+
 	jsonPM := pmID + ".json"
 
-	data, err := ioutil.ReadFile(filepath.Join("output/", jsonPM))
+	data, err := os.ReadFile(filepath.Join("output/", jsonPM))
 	if err != nil {
 		log.Errorw("load postmortem json", "pmid", pmID, zap.Error(err))
 		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)

tool/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"net/http"
@@ -81,7 +82,12 @@ func Serve() error {
 
 	log.Infow("Starting up", "host", fmt.Sprintf("http://localhost:%s", port))
 
-	return http.ListenAndServe(":"+port, router)
+	srv := &http.Server{
+		Addr:    ":" + port,
+		Handler: router,
+	}
+
+	return srv.ListenAndServe()
 }
 
 func main() {
@@ -135,7 +141,7 @@ func newPostmortem(dir string) error {
 	pm := postmortems.New()
 
 	err := survey.Ask(qs, pm)
-	if err == terminal.InterruptErr {
+	if errors.Is(err, terminal.InterruptErr) {
 		fmt.Println("interrupted")
 		os.Exit(0)
 	} else if err != nil {
@@ -153,8 +159,7 @@ func IsURL() survey.Validator {
 			return fmt.Errorf("could not decode string")
 		}
 
-		_, err := url.Parse(str)
-		if err != nil {
+		if _, err := url.Parse(str); err != nil {
 			return fmt.Errorf("value is not a valid URL: %w", err)
 		}